Mix together the 4 cups flour and salt. In saucepan, heat cream, milk, 6 tablespoons sugar and butter only until butter melts; cool. Make a well in flour and add milk mixture, yeast and egg yolks, Beat with a wooden spoon until the dough is smoothe and has a bubbly consistency. Place dough in a bowl, cover and let rise in warm place about 2 hours.

Fry krofi in shortening. Do not crowd in the pan. Turn only once so that you get a nice white ring around the center. Remove and place on paper towels to drain. When cool, sprinkle with powdered sugar.